1. Is it ok to let pressure off of the system when hot?
2. Why does my 6.0 and my friend's 6.0 have more pressure on the cap when the trucks are tuned vs when they are on stock tuning?,

Mines an 03 his is an 04. Both stock bolts, I have a sct Livewire with custom Looney tune, he has a superchips flashpaq.

Thanks guys

1). Yes, but be careful not to get burned.

2). Tuned motors produce more heat, have more boost, and have increased cylinder pressures. Increased heat equals higher pressure in a sealed system (of course until the cap vents). Increased boost and cylinder pressure is what your head gaskets are trying to contain and keep out of the cooling system. When my head gaskets let go (under a high load, high boost situation) I would get up to 22 psi in my cooking system. Cooling system pressure did not match boost pressure, but they moved upward together. After studs, o-ringed heads, full Bulletproofing, I now monitor cooling system psi. Normally is 8 to 9 psi, far below the 16 psi vent pressure of the cap.

2). Tuned motors produce more heat, have more boost, and have increased cylinder pressures. Increased heat equals higher pressure in a sealed system (of course until the cap vents). Increased boost and cylinder pressure is what your head gaskets are trying to contain and keep out of the cooling system. When my head gaskets let go (under a high load, high boost situation) I would get up to 22 psi in my cooking system. Cooling system pressure did not match boost pressure, but they moved upward together. After studs, o-ringed heads, full Bulletproofing, I now monitor cooling system psi. Normally is 8 to 9 psi, far below the 16 psi vent pressure of the cap.

Ok so what your saying is it's normal to have more pressure, someone said since I have a custom tune, the writer makes it not have as high of cylinder pressure. Is that true?

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